CalTopo for iOS extends your adventures from the desktop to the field. CalTopo contains tools to plan your backcountry adventures including offline topographic maps and aerial imagery, slope angle shading, viewshed analysis, realtime SNOTEL and weather data, and many more options. The mobile apps integrate seamlessly with the CalTopo website allowing realtime syncing with the web application allowing updates to maps and routes to be passed back and forth (while you still have cell service).

If you're traveling off the grid you can download mapping layers and maps that you've created to help guide you on your adventures. When you're back you can sync the record of your journey back to the CalTopo website. No more cumbersome exporting and importing from other apps.

Plan your next adventure today!

Layers Available: (*Indicates Offline Availability)
Map Builder Topo*
Map Builder Hybrid*
Scanned 7.5'*
FS Topo*
Marine Charts
FAA Sectionals
NAIP Imagery (Various Years)*
Shaded Relief
USFS/NPS Visitor Maps
Satellite Daily and Weekly Layers
(Note: Weekly High Res layer requires Pro subscription)
And more...

Overlays Available:
Map Builder Overlay*
Slope Angle Shading* (LIDAR slope angle shading available on/offline)
Parcel Data (Note: Requires Pro subscription)
Public Lands
Motor Vehicle Use*
Realtime weather and SNOTEL data
And many others...

What’s New

Version 0.6.6

Added global elevation, slope angle shading, and canopy data. Rework of login flow within app. Support for new events feature and guest accounts within the app.

Ratings and Reviews

4.4 out of 5
35 Ratings

35 Ratings

Christofer Williams ,

LOVE this app

The UI can be a little clunky and unintuitive (good luck trying to find your old tracks for comparison... they’re likely there, but they’re well-hidden). But the quality of maps and overlays is fantastic. I use this app on nearly every hike and ski tour.

Abnonymous ,

What a tool! the best way possible! There is SO much information here. I use All Trails to find hiking routes, and CalTopo to get more information about the area around the trail. I’ve also used it to plan or research berry harvesting areas.

I don’t really know what could be improved. It feels bare bones, but in the best way. Users are given the data options, and it is easy to navigate and manipulate map layers into valuable visual information.

SF492 ,

Reliable offline, fast, high-resolution

Recent updates have made big improvements to the point where I am comfortable going on all-day backcountry outings with no cell service. Maps are not as nicely rendered as Topo Maps+ Atlas pro layer, but trails are more accurate. Works with desktop app for managing routes, which is great. Missing fancy tool features of other apps but gets the basics very well.


CalTopo LLC
115.7 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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